I picked up a great old Yamaha BB-400 with a reverse P setup. I decided to add a second reverse P to make a bass like Lee Sklar plays. I had it routed and added a nice fat Bart 8S in the new bridge position. Now that it is all wired up, I find some phase problems with the E and A strings when both Pups are on. Doing some checking, I find that the 2 halves of the Yamaha Pup are out of phase with each other, but the Pup is not humbucking like the Bart is. I have noticed this with other early Japanese P style Pups. The 2 halves of the Bart and my Fender and every other P pickup I could find ARE in phase with each other. SO - how do I solve the problem and make it all work? Is it as easy as reversing the wires between the 2 halves of the Yamaha Pup? I am curious as to why they are reversed from each other, but not humbucking. Thanks for your help.